EP 2025068 A2 20090218 - METHOD AND SYSTEM FOR DETECTING NARROWBAND SIGNALS USING A RECEIVER WITH A WIDEBAND FRONTEND
Title (en)
METHOD AND SYSTEM FOR DETECTING NARROWBAND SIGNALS USING A RECEIVER WITH A WIDEBAND FRONTEND
Title (de)
VERFAHREN UND SYSTEM ZUM DETEKTIEREN VON SCHMALBANDSIGNALEN UNTER VERWENDUNG EINES EMPFÄNGERS MIT EINEM SCHMALBAND-FRONTEND
Title (fr)
PROCÉDÉ ET SYSTÈME DE DÉTECTION DE SIGNAUX À BANDE ÉTROITE UTILISANT UN RÉCEPTEUR À FRONTAL À LARGE BANDE
Publication
Application
Priority
- IB 2007051897 W 20070517
- US 80144906 P 20060518
Abstract (en)
[origin: WO2007135640A2] A system (100) and method (300) detect the presence of a narrowband signal having a bandwidth ?F2 in a wideband frequency channel having a bandwidth ?F1>?F2. The method (300) includes digitizing (310) a signal received in the frequency channel; transforming (320) the digitized signal into N digital frequency domain components; averaging (330) the power spectrum of the N digital frequency domain components over a plurality of samples; filtering (340) the averaged power spectrum of the N digital frequency domain components with a filter having M non-zero values spanning a bandwidth, ?F3, where N>M and ?F1>?F3; computing (350) a mean, µ<SUB>k</SUB>, a modified standard deviation, ß<SUB>k</SUB>, and a peak value, P<SUB>MAX</SUB> of the filtered, averaged power; and detecting (360) the presence of the narrowband whenever P<SUB>MAX</SUB> > (k<SUB>1</SUB>*µ<SUB>k</SUB>)+(k<SUB>2</SUB>*ß<SUB>k</SUB>), where k<SUB>1</SUB> and k<SUB>2</SUB> are selected to provide a probability of detection, a probability of missed detection, and a probability of false alarm.
IPC 8 full level
H04B 1/69 (2006.01)
CPC (source: EP KR US)
H04B 1/71 (2013.01 - KR); H04B 1/719 (2013.01 - EP US)
Citation (search report)
See references of WO 2007135640A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
WO 2007135640 A2 20071129; WO 2007135640 A3 20080124; CN 101449477 A 20090603; CN 101449477 B 20130619; EP 2025068 A2 20090218; JP 2009538026 A 20091029; KR 101431255 B1 20140821; KR 20090010057 A 20090128; US 2009185641 A1 20090723; US 8233566 B2 20120731
DOCDB simple family (application)
IB 2007051897 W 20070517; CN 200780018075 A 20070517; EP 07735961 A 20070517; JP 2009510610 A 20070517; KR 20087027799 A 20070517; US 30130407 A 20070517